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Quick Answer. It takes 9 to 10 hours to cook a 3-pound beef top round roast in a Crock-Pot at the low setting. The roast only requires about 5 hours of cooking time at the high setting, but this tough cut of meat isn't recommended for cooking on the high setting. The faster cook time and higher temperature doesn't break down the tough meat fibers and leaves the roast tough.
Cook the bottom round roast in a large cooking pot, Dutch oven or slow cooker. Any of these methods can produce a perfectly tender roast, so choose whichever method is convenient for you. 1  Regardless of which cooking vessel you choose, place a layer of chopped onions on the bottom and sit the meat on top. Oven: If you're cooking the roast in a Dutch oven, preheat the oven to 300 Â°F (149 Â°C) and slow roast the meat for 3 to 4 hours, depending on the weight. 2  A 3 to 4 pound roast will typically take about 4 hours to cook â you'll know it's done when it reaches an internal temperature of 165 to 170 Â°F (74 to 77 Â°C).